More spoilers. This tie, via the IM3 storybook. Again, some details from the film were left out.

Spoiler!!! Click to Read!:

Savin wears the Iron Patriot suit

Well, well, well. It seems Marvel has fooled us once again. Early on in filming in North Carolina, the Iron Patriot armor was noticed and everyone assumed that the man inside was James Badge Dale. Marvel of course debunked these rumors. But now that we have this tie-in book it is clear that they were fibbing. The book reads:

"And Tony and Rhodey had yet another problem on their hands: Savin was wearing the Iron Patriot armor and was heading toward Air Force One-for the President of the United States!"

You can see Savin in the suit above. Also, I would like to point out that earlier the book tells us that the Mandarin had taken it from Rhodey.

Maya Hansen is EVIL

From the very beginning, Rebecca Hall's Maya Hansen character has be shrouded in mystery. Well, at least who's side she was on. But now thank you to this book, we know that Maya Hansen is very, very bad.

"Tony snuck into the Mandarin's mansion. Unfortunately, as he was about to confront the villain, He was knocked out from behind!

He woke to find himself in a cell-with Rhodey! Out of the shadows stepped Killian and Maya. From them, Tony learned the Mandarin had the Iron Patriot armor and that Killian and Maya were working for the villain! Killian cackled with delight, but Tony had a plan."

Hmmm... I'm sure this will be a big plot twist for non-spoiler lovers! ;P

Pepper and President Ellis get kidnapped

We figured from the scene in the trailer that Pepper was in trouble, but we had no idea the President ends up being kidnapped!

After Tony catches up to Savin on Air Force One, they get into a huge battle where the fire repulsor blasts back at one another. One blast hit the exterior of the plane and people started flying out. Tony blasts Savin into a wall and the following commences:

"He dove down, and the passenger he had locked arms with then locked his arm with the next person falling. This continued with each falling passenger all the way down, resulting in a strange, midair monkey ladder.

During the commotion aboard Air Force One, Savin trapped the President with him inside the Iron Patriot suit and rocketed out of the plane with him. He had kidnapped President Ellis!

With the President in his grasp, the Mandarin released another video message.

The villain was holding the president high above an oil tanker. The Mandarin's plan was to ignite the oil onboard, causing a giant explosion and contaminating the waters of the Gulf Coast.

And to make the matters worse, the bomb was going to go off on December 25th-Christmas Day!"

From this, we know that the Mandarin is sure good at improvising! As for the Pepper kidnapping, the book does not specify how the Mandarin has taken her, but it does confirm she is at the docks.

The finale features the Iron Men vs. the Extremis Soldiers

No much of a surprise here, but at least we know that we are getting real, super-powered villains.

"All of Tony's Iron Man suits had come to save the day! There was HEARTBREAKER, RED SNAPPER, SILVER CENTURION, BONES, SHOTGUN, AND HAMMERHEAD! EVEN NIGHTCLUB, GEMINI, and the behemoth IGOR had come for a fight!

Wasting no time, the Iron Men quickly attacked, firing Repulsor beams and missiles at all of the super-powered Extremis guards. Explosions rang out as armors were destroyed and Extremis guards were defeated. Meanwhile, Rhodey ran off to rescue the President and reclaim the Iron Patriot armor while Tony went to save Pepper from a particularly large and intimidating Extremis guard."

What's interesting is that the book does not say the Mandarin comes in the final battle. In fact, it says that the Mandarin and Killian are "Still on the loose". If this part is true (though I think it is complete bull), we could definitely be looking at a Masters of Evil type thing.

The Mandarin's headquarters are in his Miami mansion

The Mandarin's base is his mansion in Miami. The relation to Osama Bin Laden aside, this seemingly proves that the Mandarin is American, or at least liver there. The book confirms numerous things like this being the location of "his lair" where he "conducts the video messages" and where him and "Killian get down do business".

Harley and Tony are attacked by Savin and Brandt

We've all heard about Harley through various interviews around the film. He seems like a great supporting character. With this, many were still concerned that we may not get any action at the time in the movie where him and Tony share the screen. Well fear not, because it seems that Savin and Brandt are continuously pursuing the billionaire superhero.

"Tony turned to see two people charging toward them, but they didn't look like regular people. Savin was glowing with energy and Brandt's hands were radiating heat. Using their enhanced abilities, they attacked Tony and Harley!

Yelling to Harley, Tony told him to use that silver capsule he gave him earlier. Harley did as instructed and threw the capsule at Savin. The capsule exploded, temporarily blinding Savin and allowing Harley to escape.
Meanwhile, Brandt had Tony cornered. But just as she was about to attack, Tony pulled back his sleeve to reveal a makeshift Repulsor ray. He fired a blast at Brandt, that knocked her across the street and into the snow!"

I'm personally really excited to see this Tony/Harley dynamic on the big screen!

Now for the smaller spoilers...

Tony is being interviewed outside the hospital, of which Happy is staying

The movie seems to be much like the first film in the sense of starting out with our hero in trouble, then flashing back to the beginning

In Tony's 1999 flashback, Killian was in a very unhealthy condition, but in present day, he's as fit as a horse

Tony is the one who completed the Extremis formula

More Iron Man 1 nostalgia comes in as Tony goes to the Middle East to fight terrorists

In the Middle East is where Tony is first introduced to the Mandarin as he threatens the US

Early on in the flick, Tony and Rhodey park their armors outside a diner

Tony appears to be having more heart issues as he gets pain and needs to leave the diner rather quickly

The Mandarin reads a fortune cookie on camera that says "You will destroy Iron Man today"

During the attack on Tony's mansion, the suit's missiles won't work so Tony throws them manually at the Choppers

Tony also uses other things like his Baby Grand piano to destroy them

The reason why Tony only has two pieces of the armor at a point in the film is because the rest of it was stuck in Harley's shed

The Mark XLII armor flies across the country numerous times to reach Tony